Combination centerhead, level, and bevel-protractor.



P. E. BKMN. vCOMBINATION GENTERHEAD, LEVEL, AND BEI/'BL PROTRAGTOR.

APPLICATION FILED 13111111.19, 1912.

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Patented June '3, 1913( P. E. EKMAN. COMBINATION CENIEREUD,v LEVEL, ANDBEVEL PRCVTRAGTORlv APPLICATION H LBD MAR. 19, 1912.

l Patented June 3, 1913.

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i- A PER ERIK ERMN, 0F WOUBN, ASSACHUSETTS. COMBINATION CENTERHEAD,LEVEL, ANB BEVEL-PROCTOR.

1,063,342" Specification of Itettere latent. Papi-,emitted Jun@ 3, 31113npplioation tiled March 19, 1912. Serial No. weie.

To all whom. t may concern.' evice embodying the invention illustratingBe it known that I, PER ERIK EkMAN, a he use of an angle bar todetermine the citizen of thel United States, residing at 003551011 fel egIOOVe- Fig l10 S 8 from ele- Woburn, county of Middlesex, State lof.vation of a protractor and level showing a eo Massachusetts, haveinvented a certain new modlfie'd form Of means for adjusting the anduseful Improvement in Combination level with relation to the protractor.Fig. Centerheads, Levels and Bevel-Protractors, 111 S e Seelen 0n line11-11 0f FE- 9 of which the following is aspecication, Referring now tothe drawings: 1 is theI reference being had therein to the accomblade towhich the protracting sector 2 is e5 1o panying drawings. pivoted on thepivot 3. The protractor sec- The invention relates to a new and usefuli301] 2 S graduated lnellnd its edile. in any combmatlon of centerhead,level and bevel Snlfnble Wny- AS Shown, the Sl'edneten beprotrector, gmswith 90 at the bottom and is gradu- In the use of centerheads with bevelproeted therefrom 0n both sides to 0. Pref- 7o tractors 1n common use,where it is desired @muy & Vernier 4 S employed also but n0t to lay outa line for a keyway or groove or neeeSSe'lly- Means are PIOVded wherebyfor a series of holes in a line on a rod which the pletleetel' may bemaintained et any is inclined to the bed or table or which is angle t0the blade O Which it iS adjusted. bent S0 s to form two arms indifferent he means shown consists of a nut 5 tapped 75 planes and it isdesired to form the groove 011e t0 engage with the .threaded end of theor series of holes in one arm in a line which IDIVP 3- A Washer 6. Wlth110D-Circular hole is at the same angle to the yhorizontal as a gtlng'OVeI e nonclrculal portion 0f the groove 01- line of holes in the otherarm, it 1 plvot 3 between the sector and the shoulder is dilicult to layout the line correctly. 7 0n the nut 5 eneblee the Clamp nut to bind e@The object of this invention is to provide the protmeto" 1 n ltsadjusted POSOII' an attachment whereby the line for the holes refelnblye Spinne' WeShel 61 S also emor keyway or groove may be vlaid outconlleyedn veniently and with close accurac A centerhead 8 1s formedwith the two The invention will be fully understood d IVeIglIlg legs 9,9, in usual manner, one a5 from the following description taken inconslde. of the head 8 being formed with a' nection with theaccompanying drawings, vertical groove or slot 10 to receive the bladeand the novel features will be pointed out 1. Th1s groove extends in asfor es the and clearly defined in the claims at the close eIOtOh 11between the legs 9, 9, and when the of the specification. legs stand ona horizontal table the inner n0 In the drawings; Figure 1 is apersppeowall of the groove will be vertical, so that tive view of o,device embodyingthe invenwhen the blade 1 is inserted into the groovetion in combination with a prick punch and 31nd the lege Fest 0n ehOIZOIIal table the placed in position on o, rod ready for Jhe inneredge of the blade will be vertical and prick punch to be struck. Fig. 2is a front 1n line with the vertex 11 of the crotch 95 to elevation ofthe device shown in Fig. 1 but formed by the legs.

with the blade and the centerhead tipped at A vertical groove 12 isformed in one face an angle, the level and the protractor beof theblade 1. A hole 13 extends horizoning still in the horizontal position.Fig. 3 tally through the centerhead 8, intersecting is a front elevationof the device standing the vertical groove 10 in the head. A key 100 e5on an yinclined arm of an angle bar, the 14 is formed with a stemadapted to pass level being horizontal and the blade and the through thehole 13, being i'latted on one protractor being in their normal positionSide to clear the blade 1 and having at its with relation to each other.Fig. et shows end a lateral projection or shoulder 15 the deviceadjusted as in Fig. Sibut stradwhich engages with the groove 12 in the105 no dling the other arm of the angle bar shown blade and serves totighten the blade in the in Fig. 3. Fig. 5 isa cross section on linehead. l 5 5 of Fig. 2 enlarged. Fig. 6 is a cross A vertical hole 16 isformed in the head section on line 6-6 of Fig. 2 enlarged. Fig. 8 of thestock intersecting the vertex 11 of 7 is a cross section on line 7,7 ofFig. 2 Athe crotch. Aplunger in the form'ofa prick 110 enlarged. Fig. 8is a section on line 8-8- punch 17 fits in said hole 16 with a slidingof Fig. 8. Fig. 9 is a front elevation of a lit and is Ait'rictionallyheld in any place to may to turn 1n its bearings. before -thefsecondprick is made, then thepricks will not bein the proper relativeposition. If, however, the punch is so held that it cannot turn tlienthe pricks will all be in the same relative position even if the pointis a little of center and for some classes of work this will besuiiicient. In order to serve as a guide that the point shall always bein the same relative position, I provide a block 19 which is clamped tothe punch and the operator ide this with relation to the blade so that te point of the punch may always be maintained in the proper relativeposition,

near enough for all practical purposes.

A level 20 is adjustably mounted on the protractor 2, being formed withan arm 21 at one end which is pivotally connected with the prot-rasterby a pivot 22 on which the level may be turned in a vertical plane to'adjust it with relation to the rotractor. The end of the pivot isscrew-t eaded to receive a bindin nut 40.Y Means are rovided whereby t elevel may be turne on this pivot and held in its adjusted position, Onemeans is that shown in Figs. 1 and 4.

This means is as follows: The swinging end of the level is formed wtlian arm 23 in which is a curved guide slot 24 formed on the arc of acircle at the center of which is the pivot 22. A guide pin 25 pro'ectsfrom thefaceA of the protractor throug the said guide slot. A lwasher 26is fitted over said guide in and a binding nut 27 is screwed onto t ethreaded end of the guide pin. Preferabl a spring washer 41 is alsoeinployed. y setting up the nuts 2,7 and 40 the arm 23 and the level 20may be clamped in any position to which they are adjusted. A pin 30projectsv from the face of the protractor. The edge of the arc-shapedarm 23 is formed with teeth which are engaged by a pinion 28 formed on abarrel 29 which fits over the pin 30, said barrel being formed with ahead 31 whereby the pinion may be rotated to adjust the level.

A modified form of adjusting mechanism for the level is shown in Fig.10. A fork 32 is formed with a shank which is screwed into the lower endof the arm 23 and extends at right angles to the face of the protractor.A swivel block 33 is formed with a hole which is loosely engaged by thepivot pin this spring is such that it will hold' .of the protractor andi 25. A nut 27 and-washers similar 1o those previously described inconnection with Fig. 1 are emplo ed. `A screw-threaded pin 3ft engageswit a ta ed out hole passing through the swivel block 33 at right anglesto the direction of the hole which is engaged by the pin 25, said pin 34havin a neck portion 35 formed between two s loulders, said neck portionengaging with the'branches of the fork 32. By turning the screw 34 thearm 23 will be moved .in one direction or the other according to thedirection of rotation of the screw pin 34, thereby swinging` the levelon its pivot. When the zero mark on the vernier points ,to 90 on therotractor the straight ed .of the level will e parallel with thestraight edge on the top theinstrument is standing on a horizontal tablethe level will be in a horizontal position, while the blade will be in avertice position.

When lthe device is to be used for determining thc location of a groovea slidable bar 36 is employed having a foot 37.

In the operation of the device if a line for a series of vertical radialholes is to be laid out on a rod A which lies horizontally, thecenterhead is placed upon the rod as shown in Fig. 1 with the 90 mark ofthe rotractor in alinement with the zero mart of the Vernier, the level20 being in a horizontal position. The prick punch 17 will then be givena tap with a hammer to force it down and cause the point of the punch toprick the rod. Then in a similar way another point will be marked on therod. A line connecting these points will be in a vertical plane passingthrough the axis of the rod.

If it is desired to mark a series of oints in line on a cylindricalsurface an at a certain angle to a vert-ical plane, as for instance atan angle of 30, then the rotractor 2 will be turned on its pivot to ringthe 60 mark on the protractor against the zero mark on the Vernier, thusmakin a :turn of 30. The level will still be retained parallel with thestraight edge of the upper side of the protractor. The centerhead willthen be placed with its legs straddling the rod A, as shown in Fig. 2,in suchposition that the level is horizontal and in this position theblade 1 and the prick punch 17 will extend .in a direction at an angleof 30 to the vertical. By means of the prick punch 17 additional pointswill be pricked in the rod A in a straight line with the first point.

Sup ose it is desired to locate a series of oints for holes in an arm Bof an angle Ear B, C, in which the arm C is inclined lo the horizontaland itl is desired that the holes which are to be drilled in the arm Bshall extend radially therein at the same angle to the horizontal thatthe arm C is inclined to the horizontal. The operation and the use o 36,as shown in Fig.

of the instrument will be as follows: (See Figs. 3 and 4.) First theinstrument will be placed on the arm C, .both legson the top of the armC, as shown in Fig. 3, -instead 5 of straddling it, and the level 2O.will be turned by its adjusting mechanism into a horizontal position,as shown in Fig. 3. The instrument then will be removed from-the I armC, leaving the level and the protractor inthe same relative position tohave just been adjusted and the legs will *then be straddled upon thearinB, as shown in Fig. 4, in such position that the. level 2O will behorizontaland the blade 1 and prick punch 17 will then stand at the sameinclinal tion to the perpendicular that they are in Fig. If new theprick punch as to prick the arm -B and then the device is shifted so asto iprick the arm B in one or more additional laces in its length, withthe level still inthe li-orizontal position, the severalpricks will -bein a straight line and a series of holes may be drilled therein orakeyway may be-cu-t 1guided .from the line of the pricks. If -dially tothe arm B these holes will extend at the same angle to the vertical thatthe arm C is to the horizgntal, that is, the said holes will be in aplane atright angles to lthe arm C.

When it is desired to use for determining the location for a' groove anangle bar or galge bar 36, as shown in Fig. 9, may be emp oyed. Theangle bar is inserted in the inner side of the blade slot before theblade lis inserted, and then said lade 1 is inserted alongside lof thebar 36, as shown in Fig. 9. As'a simple form of illustration of the useof the device,'suppose it is desired to cut a groove in a rod placed 1na horizontal position, as shown in Fig. 9. y

The holder for the rod and the cutting mechanism are not shown in thedrawings because they are well known in the art. The usual form ofholder, frame for holding the rod 1n proper relation to the cutter andadjustable with relation to the cutter both 1n the line of the travel ofthe` cutter and-.at ri ht angles thereto. The cutter usually em liyed isa rotary cutter which either trave s 1n the lengthwise direction of thegroove which is to be cut or if the cutter is stationary the carriage onwhich the rod holder is supported travels i5 1n relation to the cutterin a lengthwise direction. The cutter should be rjust twice the widthofthe lateral extension or offset of the foot 37 as measured from therighthand edge of the vertical portion of the bar 9, that is, asmeasured from a vertical line passing through the apex of the crotch9-9. Su pose the groove is to be cut lengthwise of tlie rod and it isdesired that the 5 two sides of the groove be parallel to each whichthey is struck sov that the toe these, holes are drilled ra-i theinstrument however, is a suitable` formed by the two legs` other and atequal Vdistances from a vertical pTlane passing through the axis of therod.

ow the operator will adjust his table and cutter -with relation to eachother as he can best judge by his eyes for the cutter to make e. groovein the central location above described. He will -then operate thecutter enough to just start a groove in the rod. Then he will move thetable slightly in a lengthwise direction of the rod so as to withdrawthe' rod from the 38 and 39 inl Fig.v 9 represent the two sides of thegroove which has thus been started. Before applying the instrument itshould be placed on th base ofthe rod holder to register the level 2Owi'th the said plane or base. he instrument is now applied, as shown inFi 9 straddling the rod and in such a posltion of the foot 37 willengage the side 38 t been started by the cutter. If when in thatposition the instrument level shows horiof the groove Which haspreviouslyzontal, it will indicate that the groove is started in theright `location and the instrument will ybe `removed from the rod andthe table will be again brought into position with relation to 'thecutter for the cutter to' finish vcutting the groove. If, however, whenthe test is made the instrument level shows out kof horizontal, it willindicate that the roove is started in the wrong location. In t at case.the instrument will be removedl and the table and cutter readjustedwith relation to each other so as to start the groove again as nearly asthe eye of the o erator can determine to make the correction re-(juired. The rod will again be moved away;A

rom the cutter so that the instrument can be applied as in the previoustest, and if necessary the same process. will be repeated until theinstrument shows that the groove has been started in the right location.If it is de-l sired to have another groove cut on the rod parallel withthe-first groove and extending radiallyvat a certain angle to the radialdirection of the lirst groove, as for instance 30 degrees, theprotractor should be moved|v 30 degrees without however moving the levelwith relation to the protractor, t-hus giving to the level a tilt of 30degrees. n During the operation of the cutter the rod should be clampedor otherwise secured against move-. ment in the holder. The clampingmechanism should now be loosened -to permit the rod -to be turned on itsaxis. The rod should thenbe turned on its axis a suiicient distance sothat when the instrument is applied to the rod with the toe of the footen aged with the side 38 of the groove, the leve will show horizontal,which indicates that the rod has been turned angle, 30 degrees.

through the required The rod should then again be tightened in theholder. The table will then be drawn up to bring the rod to the cutterand the machine operated to cnt the oove, which by reason of the use ofthe mstrument, as already descrlbed, will' son the upright portion ofthe angle bar may be made wider, and therefore stiffer, than could bedone if the foot extended at right angles with the upright portion.Another advantage of making the toe of the foot downwardly inclined isthat as the sides of the crotch formed by the divergug legs 9-9 areinclined to each other the foot can be drawn farther up into the crotchthan could be done if the foot.. extended at right angles to thevertical portion of the angle bar, as will be evident from inspection ofFig. 9, the upper side of the foot 37 being parallel or nearly parallelwith the inclined face of one of the legs 9. Thus the device is adaptedfor use in testing groov cut on circular stock of smaller diameter thanif the foot were at .right angles with the upright portion of the anglebar.

By the use of my device it is not necessary to mark a row of pricks toindicate the line of the groove. Y

It is obvious that there are numerous other ways in which the device maybe used, the various methods of use above described being merelyillustrative, and it is not intended that the invention shall be limitedto any particular use, but it is intended that the claims shall coverthe device itself, whatever use may be made of it.

What I claim is:

1. A centerhead and bevel prot-.rector have ing a blade, a sector-shapedpmtractor pivotally connected to the blade at the center of curvature ofthe protra/ctor, a level pivotally connected at one end to theprotractor, said level being' cafable of beingl turned on its pivot,means or turning the said level on its. pivot with relation to theprotractor and means for retaining the level in its adjusted position.

2. A centerhead and bevel ing a blade, a protractor pivotally conntherewith, a level mountedon tractor, a stock with a guideway to receivesaid blade, and a bar also mounted in said guideway having a gage footprojecting therefrom.

3. A centerhead and bevel protractor having a protractor, a level havingat one end an arm which is pivotally connected to the protractor, theother end of the level having an arm with an arc-shaped slot on a curveof which said pivot is the center, a stud projecting from saidprotractor through said slot and means connected with said stud and withsaid are shaped arm whereby the arcshaped arm may beA actuated to movethe level on its pivot.

4. A centerhead ing a protractor, a level having at one end protractorhavand bevel protractor havg an arm which is pivotally connected to theprotractor, the other end of the level having an arm with an arc-shapedslot on acurve of which said' pivot is the center,vsaid areshaped armhaving teeth on its periphery and a pinion engaging with said teethwtlreby said arc-shaped arm may-be actua engage the side of a groove,the toe ofr said foot be- 5. .In combination with a center havi barhaving a toe ing downwardly inclined from the heel of the foot `so thatthe toe may extend down against the side of the groove in the stockwhile the heel of the foot is above thegroove, said downwardly inclinedform ofthe foot permitting the foot to be drawn into the crotch whilestill permitting the extreme end of the foot to engage the groove toadapt it for stock of small diameters.

In testimony whereof I aix my signature in presence of two witnesses.

PER ERIK EKMAN.

Witnesses: f

WILLIAM A. CornLAND, Amon H. MoamsoN.

